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Kotlin
map / filter / reduce
The three classic functional combinators. Each takes a lambda and returns a new collection (or a single value for reduce). Chain freely — intermediate allocations only matter at very large scale (use `Sequence` then).
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Rust
fold / reduce / scan
`fold` is the general aggregator: starts from an accumulator, applies a fn to each item. `reduce` uses the first item as the seed. `scan` yields intermediate accumulator values.
Go
Generic Map / Filter / Reduce
Three classic functional combinators, generically typed. Go's standard library doesn't ship these (yet), but they're short enough to drop into any project.